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Business Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Net sales $ 218,378 $ 202,064
Orthopedic Surgery    
Segment Reporting Information [Line Items]    
Net sales 113,437 108,862
General Surgery    
Segment Reporting Information [Line Items]    
Net sales $ 104,941 $ 93,202